sanford



(No Model!) Lt H. ROBERTS 8v 10. E. SANFORD.

BUGKSAW FRAME. No. 395,294. Patented Deo. Z5, 1888.

N, PETERS. PxmmLixhampher, wnhington. D. C.

tricee LEVI II. ROBERTS AND CHARLES E. SANFORD, OF INDIANAPOLIS,INDIANA, ASSIGNORS TO E. C. A'IKINS & COMPANY, OF SAME PLACE.

BUCKSAWmFRAll/l E.

SPECIFICATION forming part of Letters Patent No. 395,294, dated December25, 1888.

Application filed January 3, 1888. Serial No. 259,552. (No model.)

To all who/'1t 'it may concern:

Be it known that we, LEVI H. ROBERTS and CHARLEs E. SANFORD, citizens ofthe nited States, residing at Indianapolis, in the county of Marion andState of Indiana, have invented certain new and useful Improvements inBucksaw-Franies, of which the following' is a specification.

The object of our said invention is to proio vide a double brace for theframes of buckl saws, arranged in such a manner that saidf frames willbe rendered very stiff, and also by which they may be tightened and adjusted, as l will be hereinafter more fully described and claimed.

Referring' to the accompanying drawings, which are made a part hereof,and on which similar letters of reference indicate similar parts, Figurel is a side elevation of a saw 2o embodying our said invention; and Fig.2 is a central longitudinal section of so much of the frame as relatesto our particular invention, on an enlarged scale.

In said drawings the portions marked A represent the saw; :3, the endpieces of the frame, and C the brace, which constitutes the subject-matter of our present in vention. The saw A and end pieces of the iframe B are not peculiar in their construction, said saw being 3o mountedbetween the front ends of said end pieces and their rear ends beingconnected by an ordinary tightening rod or brace, B', in the usualmanner.

The brace C i,is formed with an elliptical 3 5 opening at its center, itpreferably being constructed of two parts of equal rigidity, each end ofboth of which parts of equal rigidity is curved outwardly and the centerof which is also curved outwardly, said two parts 4o being placed sothat their ends curve in opposite directions and their centers being socurved to form the ellipse above nientioned, the bearing-points beingintermediately between these two portions, where the two parts aresecured together by rivets c',

loosely mounted in suitable perforations provided at these point-s. Theends of the brace are each tenonedand mounted in suitable mortises inthe end pieces, B, the two parts 5o so entering said mortises as tobrace against each other. At the center of the brace is mounted ascrew-threaded bolt, c, extending through both parts and provided with athumb-nut on the back side of the brace, a washer being mounted betweensaid nut and said brace, as shown.

Thile it is preferred that the brace be formed in two parts and securedItogether loosely, so that one part may be capable of a slightindependent motion, thus insuring that 6o the strain upon the respectiveparts shall be perfectly equalized, yet it will be understood that saidbrace may be formed of a solid piece with the elliptical opening sawedout if, for any reason, it should seein desirable,without departing fromour invention, which principally consists in the 'formation of the braceby which it is rendered elastic or made capable of being' extended orlengthened as a whole, and the frame thus made stiff and se- 7o cure.

The use and operation of our invention are as follows: The brace being'in position for use in the frame, as shown in Fig. l, and the saw being'tightened by means of the rod B, 75 the two parts of the brace operatein bearing against each other at the points where they come in contactto force the ends apart, thus tending to stiffen and brace the saw andprevent it from getting loose or the joints from 8o becoming worn, ashas been the case with frames of the old construction; also, when therear ends of the end pieces, B, have been drawn to the position desiredin relation to each other, if the saw shall not be sufciently tight theoperator may tighten it in this position by screwing down the thun1b-nuton the bolt c, which tends to force the central part of the bra-cetogether and forces its ends outwardly, making' it longer and securelytight- 9o ening all the joints with but very little effort; also, whenthe saw shall have been tightened as tight as possible by means of thebracerod B', if it is desired that it shall be made still more tight itwill be found an easy mat- 9 5 ter to screw down the nut on the b-olt c,thus securing' a firmness and stiness to the frame which it isvimpossible to secure with the old construction.

Having thus fully described our said invenroo tion, what we claim asnew, and desire to secure by Letters Patent, is-

1. In a saw-frame, the combination of the end pieces, and a brace, C,formed of two substantially equal parts curved away from each other atthe ends and center, and each end of each part secured in position tobrace against one of said lend pieces, the two parts of said bracebeing' arranged to brace against each other, and the means for forcingsaid two parts toward each other at the center, substantially as setforth.

2. The combination ot' the saw A, the :trame B, and the brace C, formedof two substantially equal pieces mounted to bear against each other andcurved away from each other at the ends and center, each endet1 each ofI said pieces being,1 mounted in and arranged to brace against one ofthe end pieces of the frame, and the boit c, extending through thecenter of both pieces of said brace and provided with a thumb-nut,whereby the centers of said pieces may be forced toward each other,substantially as described, and for the purposes specified.

In witness whereof we have hereunto set our hands and seais, atIndianapolis, Indiana, this 29th day of December, A. D, 1887.

LEVI n. ROBERTS. insa onARLEs E. sANEoRn. [L si] Y i tn esses:

E. W. BRADFORD, CHARLES L. THURRER.

